1. Pay attention to the detection interference between various sensors.

& nbsp; Generally speaking, each sensor corresponds to a specific detected gas, but no gas detector is absolute. Therefore, when selecting a gas sensor, it is necessary to maximize the detection interference of other gases to ensure accurate detection of specific gases.

& nbsp; 2. Pay attention to the life of each sensor.

& nbsp; Various gas sensors have a certain service life, that is, service life. Generally speaking, the LEL sensor in a portable device has a long life, which can be used for about 3 years. The life of the photoionization detector is more than 4 years, and the life of the electrochemical specific gas sensor is relatively short, generally about 1 to 2 years. The oxygen sensor has the shortest life. About a year or so. If it is not used for a long time, it can be sealed in a low temperature environment to extend a certain life.The fixture is larger and the sensor has a longer life. Therefore, the sensor should be detected at any time and used as much as possible within the validity period of the sensor. Once a failure occurs, it should be replaced immediately.

& nbsp; 3, pay attention to repeated calibration and inspection.

& nbsp; Toxic and harmful gas detectors, like other analytical and testing instruments, are also measured by relative comparison methods. First, the instrument is used to measure the gas with zero gas and standard concentration, and the standard curve is stored in the instrument for measurement. When measuring, the instrument compares the electrical signal generated by measuring the atmospheric gas concentration with the electrical signal of the standard concentration, and calculates the accurate gas concentration value.

& nbsp; 4. Pay attention to the concentration measurement range of VOC detector:

& nbsp; All kinds of toxic and harmful gas detectors have fixed inspection ranges. The measurement must be completed within that measurement range to be guaranteed. Measure correctly. Measuring beyond the measurement range for a long time will cause permanent damage to the sensor

& nbsp; For example, if the LEL sensor is accidentally used in an environment with an LEL higher than 100%, the sensor may completely burn out. Toxic gas detectors operating at high concentrations for long periods of time can also cause damage.Therefore, when using a fixed device to send an overrun signal, the measurement circuit should be closed immediately to ensure the safety of the sensor.